Gebrauchsanleitung User manual Mode d'emploi
Contents
1. if existing Insert seat to frame connection with or without the distance rings according to the requested seat height see table ccklischall R33 Turn the counterpart on the seat module against the seat to frame connection until all parts fit together Fasten the seat to frame connection with the bolt Slide 1 or 2 rings onto the bolt when necessary according to the table Tighten the screws max 8Nm SHh40 SHh41 SHh42 SHh42 SHh43 SHh44 SHh44 SHh45 SHh46 SHh46 SHh47 SHh48 ccktischall R33 cck schall K schall AG Benkenstrasse 260 CH 4108 Witterswil k schall distributors Belgium amp Luxemburg Invacare Autobaan 14 B 8210 Loppem Danmark Invacare A S Sdr Ringvej 39 DK 2605 Br ndby Deutschland amp Ost Europa Invacare Aquatec Alemannenstra e 10 D 88316 Isny Eire Invacare Ltd Unit 5 Seatown Business Campus Seatown Road Swords Co Dublin Espana Invacare S A c Areny s n Pol gon Industrial de Celr E 17460 Celr Girona France Invacare Poirier SAS Route de St Roch F 37230 Fondettes Italia Invacare Mecc San s r l Via dei Pini 62 1 36016 Thiene VI Nederland Invacare B V Celsiusstraat 46 NL 6716 BZ Ede Norge Invacare AS Grensesvingen 9 N 0603 Oslo Portugal Invacare Portugal Lda Rua Senhora de Campanha 105 P 4369 001 Porto Schweiz sterreich2. 5 5 Detecting and repairing defects 5 6 Technical data 5 7 Warranty conditions Adjustments carried out by the authorized dealer 6 1 Back height adiustment ENEE 6 2 Backrest angle adjustment 6 3 Seat height adjustment SHh Front frame Seatmodule Axle tube Rear wheel Backrest Footrest o e o o oo Front wheel Figure 1 ccktischall R33 1 General 1 1 Introduction Thank you for purchasing a lt lt ktischall wheelchair With the lt lt ktischall R33 you have purchased a top quality product In order to make optimum use of its functionalities and learn about its safety requirements please read these operating instructions carefully and follow the safety instructions 1 2 Warning and instruction signs The following signs and abbreviations are used in these operating instructions Warning sign containing important information to prevent injuries and material damage Useful information for user Required tool Hexagon socket wrench 3mm Required tool Wrench 8mm Required tool Screw driver ccktischall R33 1 3 Description of the wheelchair The wheelchair consists of a rigid frame onto which the seat module and the foldable backrest are attached Both the left and the right side frame are attached to an axle tube The rear wheels are mounted to the frame with rear wheel fixture elements The front wheels as well as the footrest
3. 5 Service 5 1 Cleaning The service life of your wheelchair increases if you maintain and clean it regularly Clean cushions and metal parts with a moist soft cloth Carefully dry your wheelchair after using it in rainy weather or after taking a shower The removable axles require particularly thorough cleaning see Chapter 5 2 Maintenance A Sand and sea water may damage the ball bearings After using your wheelchair in a dirty environment clean and dry it thoroughly as soon as possible Do not use rough scouring agents aggressive cleaning agents or high pressure cleaning machines 5 2 Maintenance We strongly advise that you should have your wheelchair thoroughly checked by the authorized dealer once a year as a minimum This is in addition to to the general maintenance procedures detailed below In order to make sure that your wheelchair will give you the necessary safety and reliability over its whole service life you lt ck schall R33 should carry out the following work regularly or have it carried out by your authorized dealer Maintenance plan Weekly Check air pressure in tyres Check the proper fitting of the rear wheel axle in the sleeve Monthly Check bolted connections Oil removable axles Check tension of spokes Yearly General check by an authorized dealer Measuring the air pressure To ensure that the driving and braking function is maintained it is important that th
4. amp Middle East K schall AG Benkenstrasse 260 CH 4108 Witterswil Sverige amp Suomi Invacare AB Fagerstagatan 9 P O Box 66 S 163 91 Sp nga United Kingdom amp Eire Invacare Ltd South Road Bridgend Industrial Estate Bridgend CF31 3PY UK Invacare Ireland Unit 5 Seatown Business Campus Seatown Rd Swords Dublin Ireland www kuschall com The k schall brand is a registered trademark Every effort has been made to ensure that the contents of this publication are fully up to date at the time of going to print As part of its ongoing improvement of products K schall AG reserves the right to modify existing models at any time k schall dealers will be notified of any such modifications Any use of this publication of of parts thereof as well as any reproduction of images must have the written consent of K schall AG 1498748 01 2007 Tout a t mis en oeuvre pour que le contenu de cette publication soit le plus actuel possible au moment de l impression Dans le cadre d un perfectionnement continu des produits K schall AG se r serve le droit d entreprendre a tout moment des modifications sur les mod les pr sent s Toute utilisation de ce prospectus dans son int gralit ou par des extraits ainsi que toute reproduction des illustrations sont interdites sans autorisation pr alable crite de la part de K schall AG Es wurde alles daran gesetzt dass sich der Inhalt dieser Publikation zum Zeitpunkt d
5. are fixed to the front frame See figure 1 1 4 Useas per specifications The wheelchair is driven manually and is used for independent or guided locomotion of gait impaired persons e g hemiplegia paraplegia tetraplegia multiple sclerosis traumatic brain injury etc The wheelchair may only be used without a guide by persons who are physically competent to handle the wheelchair eg driving steering and braking The wheelchair is designed for in and outdoor use on level ground and pathed terrain 1 5 Before using the wheelchair Before using the wheelchair for the first time please read A Chapter 2 Using the wheelchair carefully and follow the safety instructions It is essential that you check the functionality of your wheelchair daily Pay special attention on the following parts provided they are mounted Wheels backrest antitipper pushhandles quick release fork Normally your authorized dealer will unpack and unfold the wheelchair if necessary for you If you receive your wheelchair unfolded please read Chapter 3 1 Folding and unfolding the wheelchair 2 Using the wheelchair 2 1 Sitting down getting up When getting in or out of the wheelchair do not stand on A the footrests Danger of tipping You should only get on off the wheelchair if you are physically competant Please consult your physician or therapist Do not sit on the clothing guard the tire cover or the armrest when getting on off
6. until it reaches the stopper Releasing the brake Push the braking lever back beside or between your legs ccktischall R33 3 Transporting the wheelchair Folding the wheelchair sit on the wheelchair during a transport use a properly A Your wheelchair is not suitable for use in vehicles Do not secured seat Be careful when you remove the wheels from the wheelchair that you do not move the wheelchair on any abrasive surfaces e g pulling over concrete Excessive material abrasion could affect the strength of load bearing parts Figure 12 Remove the seat cushion if present Flip clothes guard inward to rest against backrest Both 3 1 Folding and unfolding the wheelchair sides The K Series has a rigid frame But the backrest can be folded Pull the pull strap on the back of the wheelchair 1 down and fixed click into position nonetheless Fold the backrest forward until it snaps into place 2 The backrest bar of the wheelchair can now be used as a handle during transport lt ck schall R33 11 12 Unfolding the wheelchair Figure 13 Pull the pull strap on the back of the wheelchair 1 Pull backrest by the backrest bar upwards until the backrest tubes on both sides of the frame snap into position 2 Reposition the clothes guards D i Do not pull the backrest bar to open the backrest without pulling the pull strap first Check that the backrest has really
7. Driving uphill To drive uphill you must set the wheelchair in motion and maintain the motion in order to be able to control the direction ccktischall R33 Figure 5 Lean forward and drive the wheelchair by pushing the hand rims quickly and powerfully Downhill When driving downhill direction and above all speed must be controlled Figure 6 Lean back and let the hand rims slip through your hands carefully You should be able to stop the wheelchair at any time by holding the hand rims periods of time by hand This applies especially to MaxGrepp fl Please note that the hand rims can heat ifyou brake for longer and Supergripp handrims 2 5 Stability and balance when sitting in the chair For many every day life activities you will have to bend out of the wheelchair forwards to the side or backwards This has a great influence on the stability of the wheelchair In order to keep your balance at any time please observe the following Leaning forward Figure 7 Align the front wheels to the front To do this move the wheelchair slightly forward and then back again Apply both parking brakes When leaning forward make sure that your abdomen remains above the front wheels Do not lean forward too much You might fall out of the A wheelchair Do not slide forward in your seat to reach out for remote objects You might fall out of the wheelchair Do not try to bend your abdomen forwa
8. see Chapter 4 Please note that a heavy backpack fixed to the backrest can affect the tipping behaviour of the wheelchair The position of the seat module influences the balance and the tipping tendency of the wheelchair The centre of gravity must be re defined after adjustments have been made 2 3 Driving over stairs and steps D Always be very careful and move slowly when driving over curbstones stairs or other steps Do not try to drive over steps which have a height of more than 25 cm Only drive on stairs with more than one step if an aide is behind the wheelchair ccktischall R33 With an aide Figure 3 Driving down a step Drive to the edge of the step make sure that the wheelchair is in a straight position Hold on to the two push handles on the rear of the wheelchair and tilt backward so that the front wheels leave the ground Hold the wheelchair in this position and push it down the step slowly The wheelchair driver can support you by using the hand rims Tilt the wheelchair forward until the front wheels have ground contact again Driving up a step D Do not lift the wheelchair by the backrest bar Move the wheelchair backward until the rear wheels hit the edge of the step Pull back both push handles tilt the wheelchair until the front wheels leave the ground and pull the rear wheels over the edge Move the wheelchair until you can safely tilt the wheelcha
9. snapped into position before using the wheelchair 3 2 Removing and installing the rear wheels To reduce the size of your wheelchair you can remove the rear wheels Figure 14 Removing the rear wheels Release the brakes With one hand hold the wheelchair in an upright position With the other hand hold the wheel at the spokes around the wheel hub see Figure 14 Press the axle knob with your thumb and pull the wheel out of the adapter sleeve Installing the rear wheels Release the brakes ccktischall R33 With one hand hold the wheelchair in an upright position With the other hand hold the wheel at the spokes around the wheel hub see Figure 14 Press the axle knob with your thumb keep it pressed Now insert the axle in the adapter sleeve of the axle tube until it comes to a rest Release the axle knob Now the wheel fits tightly After fitting the wheels always make sure that the Al removable axles are engaged completely The head must be extended completely Check by pulling the wheels outwards lt ck schall R33 13 14 4 Adjustments and options 4 1 Adjusting the parking brakes The parking brakes must be readjusted after adjusting the position of the rear wheels gt Figure 15 Make sure that sufficient air is in the tyres see Chapter 5 2 Maintenance Loosen the hexagon socket bolt at the brake holder hex socket wrench 5mm a
10. the rear wheels onto clothes when driving outdoors 4 5 Antitipper The Antitipper device prevents the wheelchair from tipping backward Figure 18 Installing the Antitipper Slide the Antitipper onto the bracket and fix it with the gickpin In any case deactivate the Antitipper device before A driving over a curbstone or a step Danger of tipping 15 16 Deactivating the Antitipper Unplug the quickpin and remove the Antitipper 4 6 Security belt Your wheelchair can be equipped with a security belt which prevents falling out of the wheelchair Se Figure 19 Belt assembly The assembly of the belt should be carried out by your A dealer Pull the belt through the backrest and position it so that the buckle is placed at the front Opening the belt Press on the PRESS button and pull the locker out of its socket The buckle will open up Closing the belt Insert the locker completely into the buckle socket Pull the belt until you are secured in the wheelchair 4 7 Passive lighting You can install two reflectors on the rear wheels 4 8 Airpump The air pump is delivered with a valve adapter Depending on the size of the valve of your model it may be necessary to turn the adapter at the air outlet of the pump Remove the locknut Take out the valve adapter Turn it around and reinstall it Tighten the locknut again ccklischall R33
11. Hh SW ST UL RH RLW Technical data Total width Total length Seat width Seat height front Seat height rear Seat angle Seat depth Length of lower leg Backrest height Backrest angle Weight Maximal load cm cm cm cm cm cm cm cm cm kg kg 75 90 56 5 66 5 83 76 34 44 49 51 40 49 Variable 37 5 45 39 48 27 48 74 78 82 86 90 9 8 9 5 100 GB SB 22 5 cm with rear wheel camber of 3 Depends on seat level length of lower leg rear wheel and position of footrest With standard configurations can vary ccktischall R33 Figure 20 21 22 5 7 Warranty conditions Standard terms This is to certify that your lt k schall wheelchair is warranted by K schall for an unlimited period of time for the frame and 24 month for all other parts This warranty is subject to the following conditions 1 Only k schall wheelchairs purchased at full price are warranted against defective workmanship and materials If a defect or fault is discovered the K schall dealer from whom the appliance was purchased should be notified immediately The manufacturer will not accept responsibility for damage caused by misuse or the non observance of the instructions set out in the user manual During the period of warranty any parts that have become defective due to faulty workmanship or materials will be renewed or repaired fre
12. be slightly until it has its round shape Insert the valve in the valve hole of the wheel rim and insert the tube in the tire the tube should be inside the tire completely without folds Starting at the valve push the tire flanks over the edge of the wheel rim with both hands Make sure that the tube is not jammed between the tire and the wheel rim objects such as screw drivers in order to prevent the inner tube D Use a bicycle tire lever for this Do not use sharp or pointed from being damaged Pump the tire up to the maximum operating pressure Make sure that the tire does not loose air anymore Spare parts All spare parts are available at your authorized dealer To determine the size of a front wheel compare its outer K diameter to the scale on the back of this manual ccktischall R33 5 3 Service life and disposal We assume that our wheelchairs will be in use daily For this reason the whole equipment is subjected to an almost continuous stress and consequently a natural wear and tear Taking this into consideration and provided that the wheelchair is maintained properly the lifetime of the K schall wheelchairs is approximately 5 years If the wheelchair is used less frequently e g if you use it inside your apartment only and if it is maintained perfectly the service life will increase accordingly For proper disposal of your wheelchair please contact your authorized dealer 5 4 Environmental Condit
13. cck schall designed for life User manual lt lt k schall 33 Table of contents GON Cl al scsicsscsscdsscessccccsscdoscecencccassoacosseonssesesssvecesssencosadsescosvess 3 1 1 Introduction 1 2 Warning and instruction sign 3 1 3 Description of the Wheel chair ssssccssssssssssssessssssssessssseees 3 1 4 Use as per specifications EE 3 1 5 Before using the WhEEIChAIL sssssssccssssescessstecssssseessssssees 3 Using the wheelchair 2 1 Sitting down getting Up EEN 2 2 Driving and steering the wheelchair 2 3 Driving over stairs and steps EEN 5 2 4 Driving on ramps and slopes ENEE 7 2 5 Stability and balance when sitting in the chair 8 2 6 Parking brakes ssccscccsusstnastassaned suenietenaiaaneieaans 9 Transporting the wheelchair scccscsssscssesssesseeeee 11 21 Folding and unfolding the wheelchair 3 2 Removing and installing the rear wheels Adjustments and options cu srsonssnssonsnnssnnennnsnnsnnsnnnene 14 4 1 Adjusting the parking brakes EEN 14 4 2 Adjusting the tension of the backrest cover 4 3 Foldable Push handles 44 Mudguards 4 5 Antitipper 4 6 Security belt 4 7 Passive lighting 4 8 Air PUMP aneneesssenssonssenessunssenssenssennseonssenssennsennsennssennssnnssnnssnnnsnen ccktischall R33 5 Service SI el nt EE 5 2 Maintenance 5 3 Service life and disposal 5 4 Environmental Conditions
14. e air pressure in the tires is correct Check weekly if there is sufficient air in the tires The optimum pressure values are indicated in the following table Type of tire Air pressure Smooth running tires 7 bars 700 kPa 100 psi Treaded tires 7 5 bars 750 kPa 110 psi Mountain bike tire 5 bars 500 kPa 70 psi If you are not sure about the tires of your wheelchair contact your authorized dealer 17 18 Oiling the removable axles To ensure the proper function of the removable axles they must be oiled at regular intervals Pour some resin free bicycle oil on a cloth and slightly oil the balls at the end of the removable axles the axle and the push button Checking the bolted connections Bolted connections may loosen if the wheelchair is used frequently Check the bolts monthly for tight fit re tighten if necessary Locknuts and locking bolts should be replaced if they become loose For replacement please contact an authorized dealer Repairing or replacing tires Take off the wheel see Chapter 3 2 Deflate the tire by pressing on the valve Lift one flank of the tire off the wheel rim Use a bicycle tire lever for this Do not use sharp or pointed A objects such as screw drivers in order to prevent the inner tube from being damaged Pull the tube out of the tire Repair the tube using a bicycle tire repair kit If repairing is not possible replace the tube Fitting tires Inflate the tu
15. e of charge by the K schall dealer The warranty will be forfeited should any unauthorised alteration be made to the equipment The purchaser s statutory rights under the consumer Protection Act are not affected If the purchaser mounts additional adaptions to their K schall wheelchair they must obtain a written authorization from K schall AG Otherwise any possible liability claims cannot be asserted Limitation of liability This warranty does not extend to the consequential costs resulting from fault clearance in particular freight and travel costs loss of earnings expenses etc K schall shall not be liable for natural wear and tear inappropriate and incorrect use defective assembly or setting up the purchaser or third parties defective or neglectful treatment use of unsuitable spares lt ck schall R33 6 Adjustments carried out by the 6 2 Backrest angle adjustment authorized dealer 6 1 Back height adjustment Figure 22 Fold down backrest loosen the counter nut of the placement bolt and tighten the bolt completely Loosen the lens head bolt Figure 21 Remove excenter turn or flip and turn to create correct Remove the adjustable backrest cover and the top Velcro angle band Replace and retighten bolt Slide the remaining Velcro bands up or down until the Open the backrest up until the bolts click into place spring clip positioned in on
16. e of the holes is visible Unscrew the placement bolt until it rest against the frame Press the spring clip into the tube and the backrest joint no longer has any leeway Adjust the backrest tube up or down into the required Retighten the counter nut position Repeat this procedure on the other side of the backrest The position of the backrest angle must be the same on A both sides of the chair Attach the Velcro band and re assemble the adjustable backrest cover ccktischall R33 23 6 3 Seat height adjustment SHh Shock absorber Figure 23 Loosen the screws and remove bolt Lift up the seat module and remove the spring the rubber and the distance rings if existing Insert spring rubber and distance rings according to the requested seat height see table Turn the counterpart on the seat module against the spring unit until all parts fit together Fasten the spring unit with the bolt Make certain to use the correct boltlength see table Tighten the screws max 8Nm 24 SHh43 SHh45 SHh47 IM WI IN The removal and fixation of the bolt is easier if the chair is put D under pressure and the spring somewhat compressed Fixed seating o MOA od Loosen the screws and remove bolt Figure 24 Lift up the seat module and remove the seat to frame connection and the distance rings
17. er Drucklegung auf dem neuesten Stand befindet Im Rahmen der fortlaufenden Verbesserungen der Produkte beh lt sich die K schall AG das Recht vor jederzeit nderungen an den pr sentierten Modellen vorzunehmen Diese nderungen werden den k schall H ndlern umgehend mit UM_R33 ENG DEU FRA geteilt Jegliche Verwendung dieser Publikation ganz oder auszugsweise sowie die Verfielf ltigung von Abbildungen sind ohne schriftliche Zustimmung von K schall AG untersagt Ee 374 4 gt 5 gt 6 gt
18. ions The wheelchair should not be exposed to temperatures lower than 20 C or higher than 40 C ccktischall R33 19 5 5 Detecting and repairing defects The daily use of the wheelchair new adjustments or changed requirements may result in defects which can be repaired We recommend that the adjustments should be carried out by your authorized dealer Defect Wheelchair does not roll straight Wheelchair tips too easily Poor or asymmetric brake grip Rolling resistance is very high Front wheels vibrate when driving fast Seat cover loose 20 Possible cause Wrong air pressure in one of the rear wheels One or more spokes are broken Spokes are not equally tightened Front wheel bearings dirty or damaged Rear wheel mounted too far to the front Backrest angle too large Wrong air pressure in one or both rear wheels Rear wheels are off track Wrong air pressure in the rear wheels Tension at front wheel bearing block too low Fixation fatigued or ripped off Remedy Correct air pressure Chapter 5 2 replace defective spoke s Tighten the loose fitting spokes Clean or replace bearing Mount rear wheel further back only possible with rear wheel extension Chapter 6 4 Reduce backrest angle Chapter 6 3 Correct air pressure Chapter 5 2 Change track Correct air pressure Chapter 5 2 Tighten nut at bearing block axle slightly Replace seat cover lt ck schall R33 5 6 GB GL SB SHv S
19. ir forward and the front wheels have ground contact again Without an aide D If you want to drive down a step without a guide you must have perfect control over your wheelchair and must be able to balance it on the rear wheels see Finding the Tipping Point in Chapter2 2 Figure 4 Driving down a step Drive to the edge of the step make sure that the wheelchair is in a straight position Lift up the front wheels from the floor by shifting your body weight and keep your balance Now let the two rear wheels roll down over the edge Make sure to hold the hand rims tightly Tilt forward the wheelchair until the front wheels have ground contact again Driving up a step Drive the wheelchair backward until the rear wheels hit the edge of the step ccklischall R33 Lift up the front wheels from the floor by shifting your body weight and keep your balance Now let the two rear wheels roll up over the edge Make sure to hold the hand rims tight Move the wheelchair until you can tilt the wheelchair forward safely Lower the front wheels again 2 4 Driving on ramps and slopes Only drive on long slopes if a guide is behind the A wheelchair Do not drive on steep or lateral slopes max assending grade 7 Danger of tipping Avoid abrupt changes of direction when driving on slopes Danger of tipping Never pull the parking brakes when the wheelchair is in motion Danger of tipping
20. nd move the brake to the required position With the brake applied the brake shoe should not sink into the tyre more than 4 mm Tighten the hexagon socket bolt at the brake holder again The function of the parking brakes is only ensured if A sufficient air is in the tyre see Chapter 5 2 Maintenance 4 2 Adjusting the tension of the backrest cover If your wheelchair is equipped with a backrest cover with adjustable tension you can adjust the tension of the backrest cover to your individual requirements A Remove the backrest cushion Figure 16 Loosen the Velcro straps on the rear side of the seat cover by simply by pulling them off Tighten or loosen the straps as required and fix them again Fl Adjusting the backrest see Chapter 6 ccklischall R33 4 3 Foldable Push handles D Figure 17 Folding Push handles Hold wheelchair with one hand Grasp push handle with the other hand and press the trigger which is hidden under the plastic with thumb Pull the push handle back and fold down Unfolding push handle Pull the push handle upwards into the horizontal until it has snapped into place Certify that the push handles have actually been snapped A into position so that they cannot accidentally fold down again when pushing the wheelchair ccktischall R33 4 4 Mudguards Removable mudguards can be mounted to the wheelchair to prevent dirt and mud from spraying from
21. rd between your legs in order to pick up something from the floor ccklischall R33 Leaning backward Figure 8 Align the front wheels to the front To do this move the wheelchair forward a bit and then back again Do not apply the parking brakes Reach out backward only as much as possible without leaving your sitting position A Do not lean over the backrest You might tip backward ccktischall R33 2 6 Parking brakes If your wheelchair is not equipped with a drum brake deceleration is effected manually by applying force on the hand rims of the rear wheels The parking brakes are used only for keeping the wheelchair in place when standing and to prevent it from rolling away The correct function of the parking brakes is ensured only if sufficient air is in the tire see Chapter 5 2 Maintenance A Never apply the parking brakes when the wheelchair is in motion Danger of tipping Fl For adjusting the parking brakes please see chapter 4 Standard brake Figure 9 Applying the brake Push the brake lever forward until it reaches the stopper Releasing the brake Pull the braking lever back Performance brake Figure 10 Applying the brake Push the brake lever forward until it reaches the stopper Releasing the brake Pull the braking lever back 10 Active brake Figure 11 Applying the brake Pull the braking lever forward beside or between your legs
22. the wheelchair They might bend or break Danger of injury The method you use to transfer in and out of your wheelchair will depend on your own capabilities Generally the procedure is as follows Pull the parking brake Hold on to the wheelchair and if necessary to a stable object nearby 2 2 Driving and steering the wheelchair Finding the tipping point The tipping point of the wheelchair depends on the adjustment of the seat position The correct seat position is adjusted depending on parameters such as the weight of the user the type of handicap and the driver s driving skills The seat position which is adjusted upon delivery corresponds to the information indicated in your order Figure 2 To find the tipping point of your wheelchair proceed as follows see Figure 2 stand directly behind the wheelchair in order to catch it in case it tips To ensure that you are in control of your wheelchair at any given point you should not exceed a speed of 7km h 4Mph A When determining the tipping point an aide must always Loosen the brakes Sitting in the wheelchair move forwards briefly hold both hand rims tightly and pull back with a slight swing By shifting your weight slightly and applying a counter force to the hand rims the tipping point can be determined ccklischall R33 To avoid the wheelchair tipping backward we recommend that the wheelchair should be equipped with an antitipper
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